Help Indentify

[lou.micevski]

Hi guys,
Hope someone can help !!
i have just purchased a flat looking rock with about ten morphs on it
i have just noticed that the rock will slowly open and then slam shut like a mouth can someone tell me what that may be ???

 

[Sugar Magnolia]

Some type of mollusk would be my guess.

 

[Kmiller035]

Picture?


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[lou.micevski]

its what the morphs a living on its the best i can get

 

[mcgyvr]

yep more than likely just a mollusk/bivalve.. Harmless and very common

 

[lou.micevski]

thanks guys !!!